st10-2g gas two compartment convection steamer with twin ... · pdf filest10-2g gas two...

EFFECTIVE AUGUST 12, 2014

ST10-2GGAS TWO COMPARTMENT CONVECTION STEAMER

WITH TWIN GENERATORSPARTS AND SERVICE MANUAL

MARKET FORGETelephone: (802) 658-6600 Fax: (802) 860-3732

www.marketforge.com

P/N 14-0289 Rev A (8/14)

Superseding All Previous Parts Lists.The Company reserves the right to make substitution in the event that items specified are not available.

ERRORS: Descriptive and/or typographic errors are subject to correction.

AUGUST 12, 2014 2 ST10-2G STEAMER

TABLE OF CONTENTS

WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

ILLUSTRATED PART LIST

COMPLETE EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

DOOR ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

BURNER PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

GAS ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

CONTROL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18


WIRING DIAGRAMS

MO

DEL: ST10-2G

(120V

)


WIRING DIAGRAMS

MO

DEL: ST10-2G

(120V, R.O

.)


WIRING DIAGRAMS

MO

DEL: ST10-2G

(220V

)


WIRING DIAGRAMS

MO

DEL: ST10-2G

(220V, R.O

.)


TROUBLESHOOTINGGENERALThe information in this section is intended to assist both the operator and service personnel in locating the gen-eral source of problems that may occur with the cooker. Before following any of the procedures given in this sec-tion, the operator should be thoroughly familiar with the operating instructions and the function of all controls that are described. If the problem cannot be readily corrected, the operator should contact the nearest service agency for assistance.The electrical troubleshooting procedures that follow re-quire access to components and terminals of the electri-cal control panel. Electrical controls are reached by re-moving screws that fasten the control panel to the frame. The panel may be pulled forward for testing while inter-connected to the cooker circuits or disconnected at the pin connection for complete removal and repair.

INCOMING POWERBefore troubleshooting any of the electrical parts or as-semblies, verify that power is being supplied to the cook-er. Incoming power is connected to the terminal block in the upper controls section, accessible by the right side panel. With power connected to the cooker, an AC volt-meter is used to measure 120 volts across L1 and L2. If

120 volts is present, and the cooker will not operate, the fault lies within the electrical circuits of the cooker.

WARNINGBefore removing control panel or checking connections and wiring, be sure that the cir-cuit breaker for incoming power is OFF. When power is supplied, all exposed terminals of the control panel carry 120 Volts.

ELECTRICAL FAULT ISOLATIONCorrection of an electrical failure first requires isolation of the fault to a single circuit or component. In most cases, the nature of the failure and its effect upon the operation of the cooker will be sufficient to narrow it down to one or more circuit elements. See “Electrical Fault Isolation Guide” for isolating electrical faults.

ELECTRICAL TROUBLESHOOTING PROCEDURESBefore performing the troubleshooting procedures in this section, the serviceman must be familiar with the function of all controls as described as well as with the Principles of Operation.

ELECTRICAL FAULT ISOLATION GUIDE

FAILURE FAULT LOCATION1. Will not operate in either CONSTANT STEAM or 60-MIN-

UTE TIMER position.a. Incoming powerb. Timerc. Door interlock switchd. Wiring

2. Operating in CONSTANT STEAM position but not in 60-MINUTE TIMER position.

a. 60-minute timerb. Wiring

3. Operating in 60-MINUTE TIMER position but not in CON-STANT STEAM position.

a. Timerb. Wiring

4. Will indicator light on and steam solenoid valve open time dial fails to turn.

a. Compartment thermostatic switchb. Constant steam positionc. Timer motord. Wiring

5. Buzzer fails to sound at end of 60-MINUTE TIMER mode. a. 60-minute timer contactsb. Buzzerc. Wiring

6. Steam flows continuously from boiler drain line. a. Thermostatic cooling valve needs adjustingb. Thermostatic cooling valve needs replacingc. Wiring


TROUBLESHOOTINGELECTRICAL INSPECTIONThe first step in any electrical troubleshooting procedure is a thorough physical inspection of all wiring connec-tions. To access electrical components, remove the right-side access panel on the upper cabinet.Check all wiring connections by hand to assure that both ends of all connection points are tightly secured. Use a screwdriver to tighten connection points. If necessary, vi-sually inspect all quick-disconnect terminals for evidence of corrosion. Terminals in this condition should be sepa-rated, cleaned with emery cloth until shiny, and tightly re-connected.

60 MINUTE TIMERTimer ContactsDefective timer contacts will result in failure of either cook-er compartment to operate. When this occurs, remove the control pan and proceed as follows:1. Turn off power to the cooker at external circuit break-

er.

2. Disconnect all five wires from timer terminals.

3. Connect an ohmmeter between terminals 1 and 3.

4. Rotate timer dial beyond the “0-Minute” point (any setting) to obtain a reading of zero ohms on the ohmmeter. If zero ohm reading cannot be obtained, timer contacts are defective and the timer must be replaced.

5. Move ohmmeter leads to terminals 1 and 4.

6. Rotate timer dial to “0-Minute” position (an audible click indicates correct position). If zero ohm reading cannot be obtained, the timer is defective and must be replaced.

7. Remove ohmmeter and replace all five leads on timer terminals.

Timer MotorA defective timer motor will cause continuous operation in the TIME mode, with the timer dial failing to return to the “0-Minute” position. Since thermostatic switch failure can cause the same symptom, fault must first be isolated to the timer by testing the thermostat.To confirm timer motor condition, proceed as follows:1. Carefully check motor wire leads and tighten loose

connections.

WARNINGUse care while working with control panel. Terminals carry 120 Volts.

2. Turn on power to the steamer.

3. Set timer dial (any setting beyond “0-Minute”). If op-eration is correct, the motor will turn the dial toward “0-Minute”. If the motor fails to operate, it is defective and the entire timer must be replaced.

4. Shut off power to the cooker.

DOOR INTERLOCK SWITCHMalfunction of the cooker door interlock switch prevents timer indicator lights from turning on and steam solenoid from opening when the timer dial is set. If steam does not enter the compartment and the cooking indicator light fails to turn on with the door latch securely engaged, the fault may be in the door interlock switch. Proceed as follows:1. Turn off power to the cooker.

2. Disconnect wires to the door switch terminals.

3. Connect an ohmmeter between the terminals of the switch.

4. Actuate the switch by closing the cooking compart-ment door. If a zero reading cannot be obtained, the switch is defective and must be replaced.

5. Remove the ohmmeter and replace the leads on switch terminals.

INDICATOR LIGHTSIf the cooker compartment functions correctly, with the single exception that the indicator light fails to light during operation, the fault is a defective indicator light. A “burned out” or defective light is verified by using an AC volt-meter at the leads, with input power on the selector switch in the correct position for that timer, the timer set, and the door latches closed. If 120 volts is present, the fault is in the indicator light and requires replacement. If 120 volts is not present, the fault is in the wiring or control components (selector switch, timer or door switch).


TROUBLESHOOTINGCOOKING COMPARTMENT THERMOSTATIC SWITCHA thermostatic switch included in the circuit for the timer motor delays timer operation until steam flowing into the compartment satisfies the temperature-actuated switch device. If a timer motor fails to operate within about one minute after the indicator light comes on (with cooker compartment empty), the cause may be a defective ther-mostatic switch. To test the switch, proceed as follows:1. Disconnect the two wires connected to the thermo-

static switch terminals.

2. Connect an ohmmeter between the two terminals.

3. Place the cooker into operation and observe ohmme-ter dial. Within one minute of operation, the switch contacts close automatically to register a zero ohm reading on the dial. If zero ohm reading is not ob-tained, the switch is defective.

4. Shut off cooker, disconnect ohmmeter leads, and re-place wires on switch terminals.

BUZZERIf the buzzer does not sound at the termination of the op-erator-selected timer setting (timer dial returned to “0-Min-ute” position), the fault may be a defective buzzer. Buzzer operation is verified using an AC volt-meter at buzzer coil connections with input power on and selector switch and coinciding timer dial set at the “0-Minute” position. If volt-age is 120 volts, the fault is in the buzzer, which must be replaced. If 120 volts is not present, the fault is in the wir-ing or control components (timer or selector switch).

WIRINGUsing an ohmmeter, wiring continuity between the con-nections shown on the wiring diagram is readily verified. This is best done in stages, removing only those wires required for each continuity check. As each lead is re-placed, it should be checked for evidence of corrosion, and cleaned if necessary. All leads must be tightly at-tached so as to provide a good electrical connection.

TROUBLESHOOTING GUIDE

PROBLEM PROBABLE CAUSE(S) REMEDY1. Cooking Indicator light fails to light

with timer set.a. Constant steam position. a. Locate external circuit breaker for

incoming power and place in ON position.

b. Door interlock switch contacts not closed.

b. Shut cooker door to close switch contacts. Check alignment of door with switch.

c. Door interlock switch faulty. c. Replace switch.d. Indicator light burned out. d. Replace light.e. Faulty timer contacts. e. Replace timer.f. Faulty wiring. f. Inspect condition of wire and tight-

ness of all connections. Correct as needed.

2. Steam fails to enter cooking com-partment with cooking indicator light on.

a. Faulty wiring. a. Inspect condition of wire and tight-ness of all connections. Correct as needed.

3. Steam enters compartment continu-ously. Timer dial not turning.

a. Constant steam position. a. Move knob to timing location.b. Faulty thermostat switch. b. Replace switch.c. Faulty timer motor. c. Replace timer.d. Faulty wiring. d. Inspect condition of wire and tight-

ness of all connections. Correct as needed.


TROUBLESHOOTING

PROBLEM PROBABLY CAUSE(S) REMEDY4. Steam continues to flow into compart-

ments and/or buzzer fails to sound at end of timer setting.

a. Timer contacts faulty. a. Replace timer.b. Buzzer faulty. b. Replace buzzer.c. Faulty wiring. c. Inspect condition of wire and

tightness of all connections. Correct as needed.

5. Steam flows continuously from boiler drain line with cooking in operation.

a. Cold water not connected. a. Turn on external shut off valve.b. Thermostat cooling valve (TCV)

needs adjusting.b. See “Performance Check”

c. Faulty thermostatic cooling valve.

c. Replace thermostatic cooling valve.

d. Faulty wiring. d. Inspect condition of wire and tightness of all connections. Correct as needed.

6. Door Leaks* a. Damaged door gasket. a. Check gasket for cuts and re-place.

b. Door latch. b. Adjust tension.c. Door hand. c. Adjust tension.

7. Water Flows into cooking compart-ment*

a. Level probe short circuited. a. Check and correct.b. Scale build-up on probe. b. Clean all probes.c. Water fill solenoid valve. c. Plugged, defective, clean or re-

place.8. Water accumulates in compartment. a. Plugged compartment drain. a. Remove screen and clean drain

line.9. Water flows into drain during shut

down.a. Thermostatic cooling valve does

not close.a. Check valve for foreign material,

or damage.10. Water not being supplied to generator. a. Water supply off. Check in coming water valve is

on.b. Supply water pressure to low. Check supply agency.c. Defective water solenoid valve. Replace or clean.d. Level probe shorted. Check and correct.e. Defective water level control. Replace.f. Drain valve is open. Check valve, clean or replace.

*NOTE: THESE PROBLEMS ARE AN INDICATION OF SEVER WATER CONDITIONS WHICH SHOULD BE CORRECTED IMMEDIATELY TO AVOID DAMAGE TO THE COMPONENTS AND PERFORMANCE OF THE STEAMER. CALL YOUR SERVICE AGENCY FOR ASSISTANCE. Got to www.mfii.com to find a service agency near you.


ADJUSTMENTSAll units are adjusted at the factory. In case of operation problems at initial installation, check type of gas supply and manifold pressure and compare it with information on the rating plate.

WARNINGAt least twice a year, have an authorized service person clean and adjust the unit for maximum performance.

WARNINGAdjustments and service work may be per-formed only by a qualified technician who is experienced in, and knowledgeable with the operation of Commercial Gas Cooking Equip-ment. However, to assure your confidence, contact your authorized service agency for reliable service, dependable advice or other assistance and for genuine factory parts.

DOOR GASKET REPLACEMENT:The cooking compartment door gaskets are made of a silicone-type rubber material that is very durable but sub-ject to wear during normal operation. Should the gasket leak, readjust the door gasket to the unit or replace it.

Procedure - Replace Gasket:1. Open the cooking compartment door.

2. Remove the screws from the gasket retaining plate and remove.

3. Remove the old gasket and replace the new gasket.

4. Re-install gasket retaining plate with screws.

5. The door will be very difficult to close initially. Firmly slam the door to close. The gasket will set in about an hour enabling the door to close easily thereafter.

Exterior Panel Removal:

WARNINGTo prevent hazard in servicing the cooker, be certain that the steam supply boiler is shut down, the cold water shut-off valve is closed, and the electrical disconnect circuit breaker for the Cooker/Boiler unit is OFF before re-moving side panels.

Access to all internal plumbing and electrical assemblies is from the right side and right front.The right-side panel is removed by removing the bottom screw and pushing up on the panel until the lower lip dis-engages the frame.

BURNER TROUBLESHOOTING GUIDE

PROBLEM PROBABLE CAUSE(S) REMEDY1. Burners do not come on. a. Gas supply is off. a. Locate supply line and turn on.

b. Power switch is off. b. Locate switch in cabinet and turn on.

c. Probe not sensing water level. c. Clean probes, check wiring.d.. Ignitor not functioning. d.. Check ignition module, relay.e. Combination gas valve not opening. e. Check that control knob is in

the ON position, check that 120 volts is at the gas valve.

2. Burners produce carbon deposits. a. Incorrect orifice size. a. Check size and correct.b. Incorrect gas supply. b. Check size and correct.c. Incorrect gas pressure. c. Check gas pressure at manifold,

correct if necessary.3. Flash back. a. Burning inside mixer tube. a. Reduce primary air.

b. Incomplete combustion. b. Increase burner input.c. Sooting of burner. c. Increase primary air.d Misallocated ignitor. d Adjust ignitor.


COMPLETE EXPLODED VIEW


COMPLETE EXPLODED VIEWITEM PART NO. DESCRIPTION QTY

1 97-6721 LEFT HAND SIDE PANEL 12 97-6173 DOOR ASSEMBLY 23 97-6884 SCREW, 10-32 x 1” STAINLESS STEEL 64 97-6837 FLUE SUPPORT 25 97-6838 FLUE TOP 26 97-7314 FLUE 27 97-7315 DECAL, LEXAN - ST10-2G 18 97-6178 STRIKER (3498) 28 97-6302 WASHER, STAINLESS STEEL 28 97-6650 LOCK WASHER 28 97-5601 NUT, 1/2-20 UNF 29 97-6170 PILOT LIGHT – GREEN 4

10 97-6171 PILOT LIGHT – RED 211 08-3826 DIAL TIMER 2

11A 08-6464 TIMER, 60-MINUTES 212 97-6367 SWITCH, 120V 213 98-6047 ROTARY SHAFT SEAL 214 97-6846 DELIME FUNNEL 115 97-6188 ELBOW, 3/8” COPPER x 1/8” MPT 416 97-6847 STEAM DIVERTERS 817 97-6340 RACK HANGER ASSEMBLY 1218 97-6334 COMPARTMENT STRAINER 219 97-5619 THERMOSTAT FITTING 220 97-5897 HIGH LIMIT THERMOSTAT 2*20 97-7316 HIGH LIMIT THERMOSTAT COVER 221 97-6849 ELBOW – BLOWDOWN, 3/4” C x 3/4” MPT 422 97-6283 BLOWDOWN VALVE, 3/4” C x 3/4” MPT 223 97-6850 BRASS PLUG, 3/8” MPT 224 97-6611 45o BRASS ST. ELBOW, 3/8” MPT 225 97-6891 RELIEF VALVE EXTENSION 226 97-6486 FLANGED LEG ASSEMBLY, 6” 2*27 97-6406 SWIVEL CASTER, 5” c/w BRAKE, OPTIONAL 2*28 97-6561 SWIVEL CASTER, 5”, OPTIONAL 229 97-6175 PAN RACK, 6 PAN 430 97-6177 PERFORATED TROUGH 131 97-6852 CABINET DOOR ASSEMBLY 132 97-6739 SCREW, 10-32 x 1/2”, STAINLESS STEEL 1233 97-5922 GENERATOR TANK 234 97-5472 PILOT LIGHT, 120V – GREEN 235 97-7317 TOP COVER 1


COMPLETE EXPLODED VIEWITEM PART NO. DESCRIPTION QTY

36 97-6886 SCREW, 1/4-20 x 1/2”, STAINLESS STEEL 237 97-7318 FLUE COVER 138 97-6191 DOOR SWITCH 238 97-6301 ACTUATOR PIN c/w CLIP 239 97-6876 ELBOW, 3/4” C x 3/4” FPT 840 97-6875 STEAM MANIFOLD 4

**41 97-6872 STEAM TUBE, BOTTOM LEFT, 18” 141 97-5988 STEAM TUBE, BOTTOM RIGHT, 30” 141 97-6873 STEAM TUBE, TOP LEFT, 48” 1

**41 97-6874 STEAM TUBE, TOP RIGHT, 36” 142 97-6869 SIDE PANEL 143 67-6860 CONNECTOR, 3/8” C x 1/2” MPT 1

44A 97-5952 GENERATOR FILL SOLENOID, UPPER CAVITY 144B 97-5952 GENERATOR FILL SOLENOID, LOWER CAVITY 145 97-6344 CONNECTOR, 3/8” C x 1/8” MPT 146 97-6327 TEE, 3/8” C x 3/8” C x 1/8” MPT 147 97-6862 ELBOW, 3/8” C x 1/2” MPT 148 97-6863 THERMOSTATIC COOLING VALVE 1*48 97-6864 COOLING VALVE BRACKET 149 97-6865 PROBE, 2” 250 97-6866 PROBE, 2-1/2” 251 97-6867 PROBE, 3” 252 97-6219 RELIEF VALVE, 5 PSI 253 97-6226 WATER FILL – BULK HEAD, 3/8” C 254 97-5702 CORD SET, 120V 155 97-7319 BACK PANEL 1*56 97-6888 DRAIN BOX ASSEMBLY 1*57 97-7190 CONNECTOR, THERMOSTAT BULB 1*58 97-6889 CONNECTOR – DRAIN, 3/4” C x 3/4” MPT 2*59 97-6890 UNION ELBOW, 3/4” – DRAIN 2*60 97-6664 THERMO SWITCH, LOAD COMPENSATING 2

* Not shown.** Select as required.


DOOR ASSEMBLY

ITEM PART NO. DESCRIPTION QTY1 97-6227 DOOR FRAME (2840) 22 97-6432 DOOR HANDLE ASSEMBLY 2

*2 97-6771 DECAL 22 97-6232 LATCH ASSEMBLY (3900) 2

4A 97-7146 SPACER, UPPER 24B 97-7416 SPACER, LOWER 25 97-6261 DOOR BUSHING 86 97-6229 GASKET PLATE (2842) 27 97-6228 GASKET (2669) 28 97-6230 DOOR PANEL 29 97-6233 SCREW, 10-32 X 1/2” 16

10 97-6739 SCREW, 10-32 X 1/2” 1211 97-6835 HINGE ROD (3977) 1

* Not shown.


BURNER PARTS

ITEM PART NO. DESCRIPTION TQ

1 97-6900 BURNER BRACKET ASSEMBLY 2

2 97-6901 BRACKER, PILOT ASSEMBLY 2

**3 97-6902 PILOT BURNER, NATURAL GAS 2

3 97-6903 PILOT BURNER, PROPANE GAS 2

4 97-6904 BURNER COVER 2

5 97-6905 ORIFICE JET, NATURAL GAS, #52 16

5 97-6906 ORIFICE JET, PROPANE GAS, #61 16

** Select as required.


GAS ASSEMBLY

ITEM PART NO. DESCRIPTION QTY

1 97-7320 NIPPLE, 3/4 NPT x 32 LG. 1

2 97-5555 REDUCING ELBOW, 150#, 1/2 NPT x 3/4 NPT 1

3 97-7321 NIPPLE, 1/2 NPT X 9-1/2 LG. 2

4 97-6859 TEE, 150#, 1/2 NPT 1

5 97-6910 ELBOW 90o, 150#, 1/2 NPT 1

6 98-6109 CLOSE NIPPLE, 1/2 NPT 2

7 97-5490 UNION, 150#, 1/2 NPT 2

8 97-7322 NIPPLE, 1/2 NPT x 2-1/8 LG. 4

**9 97-6461 COMBINATION CONTROL VALVE, NATURAL 2

**9 97-6462 COMBINATION CONTROL VALVE, PROPANE 2

10 09-4844 UNION ELBOW, 1/2 NPT 2

11 97-6908 SQUARE HEAD PIPE PLUG, 1/8 MPT 2

12 97-7323 MANIFOLD ASSEMBLY 2** Select as required.


CONTROL BOARD


CONTROL BOARD

ITEM PART NO. DESCRIPTION QTY

1 97-5945 BUZZER, 120V 2

2 97-6912 COMPONENT MOUNTING BOARD 1

3 97-5048 OPERATING THERMOSTAT 2

4 97-6913 IGNITION MODULE, INTERMITTENT PILOT 2

5 97-6914 TRANSFORMER, 115/230V – 24V CT 2

6 97-5441 GROUNDING LUG 1

7 10-6963 TERMINAL BLOCK 2

8 10-6962 TERMINAL BLOCK END SECTION 1

9 97-5992 RELAY, SPDT, 120V 4

10 97-5991 RELAY, DPDT, 120V 2

11 98-6138 TRANSFORMER, 240/480V – 120V, 50/60 Hz 2

**12 97-6186 GLASS FUSE, 2 AMP, 120V 2

**12 98-6134 GLASS FUSE, 1 AMP, 208-240V 2

13 97-5864 FUSE HOLDER 2

**14 97-5948 LEVEL CONTROL BOARD, 10k OHM, 120V 2

**14 97-6200 LEVEL CONTROL BOARD, 1 M OHM, 208-240V 4** Select as required.

st10-2g gas two compartment convection steamer with twin ... · pdf filest10-2g gas two...

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